Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°C
2 atm
Pt

2 atm

Explanation:

Different symbols have different meanings in chemistry. For example, the symbol Δ = adding energy to the reactants.

To identify whether the reactants combine with a specific pressure, we have to use the symbol atm, in such a case 2 atm.

Hope that helps!

the answer would be a